A really silly question about lemmy instances I believe

Hello folks! I created the MetalVinyl a few days ago and was just having a look on some other instances (I am on lemmy world and the sub was also created there - I believe?). Weirdly if I head over to lemm.ee or beehaw.org and try to find it, it’s not showing up but I can see other subs from lemmy.world? Did I do anything...